<template>
  <div class="app-container">

    <!-- 查询和其他操作 -->
    <div class="filter-container">
      <el-input v-model="listQuery.question" clearable class="filter-item" style="width: 200px;" placeholder="请输入问题"/>
      <el-button v-permission="['GET /admin/issue/list']" class="filter-item" type="primary" icon="el-icon-search"
                 @click="handleFilter">查找
      </el-button>
      <el-button v-permission="['POST /admin/issue/create']" class="filter-item" type="primary" icon="el-icon-edit"
                 @click="handleCreate">添加
      </el-button>
      <el-button :loading="downloadLoading" class="filter-item" type="primary" icon="el-icon-download"
                 @click="handleDownload">导出
      </el-button>
    </div>

    <!-- 查询结果 -->
    <el-table v-loading="listLoading" :data="list" element-loading-text="正在查询中。。。" border fit highlight-current-row>
      <el-table-column align="center" width="100px" label="问题ID" prop="id" sortable/>

      <el-table-column align="center" min-width="200px" label="问题内容" prop="question"/>

      <el-table-column align="center" min-width="400px" label="问题回复" prop="answer"/>

      <el-table-column align="center" label="操作" width="250" class-name="small-padding fixed-width">
        <template slot-scope="scope">
          <el-button v-permission="['POST /admin/issue/update']" type="primary" size="mini"
                     @click="handleUpdate(scope.row)">编辑
          </el-button>
          <el-button v-permission="['POST /admin/issue/delete']" type="danger" size="mini"
                     @click="handleDelete(scope.row)">删除
          </el-button>
        </template>
      </el-table-column>
    </el-table>

    <pagination v-show="total>0" :total="total" :page.sync="listQuery.page" :limit.sync="listQuery.limit"
                @pagination="getList"/>

    <!-- 添加或修改对话框 -->
    <el-dialog :title="textMap[dialogStatus]" :visible.sync="dialogFormVisible">
      <el-form ref="dataForm" :rules="rules" :model="dataForm" status-icon label-position="left" label-width="100px"
               style="width: 400px; margin-left:50px;">
        <el-form-item label="问题" prop="question">
          <el-input v-model="dataForm.question"/>
        </el-form-item>
        <el-form-item label="回复" prop="answer">
          <el-input v-model="dataForm.answer" :rows="8" type="textarea" placeholder="请输入内容"/>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取消</el-button>
        <el-button v-if="dialogStatus=='create'" type="primary" @click="createData">确定</el-button>
        <el-button v-else type="primary" @click="updateData">确定</el-button>
      </div>
    </el-dialog>

  </div>
</template>

<script>
  import {createIssue, deleteIssue, listIssue, updateIssue} from '@/api/issue'
  import Pagination from '@/components/Pagination' // Secondary package based on el-pagination

  export default {
    name: 'Issue',
    components: {Pagination},
    data() {
      return {
        list: null,
        total: 0,
        listLoading: true,
        listQuery: {
          page: 1,
          limit: 20,
          question: undefined,
          sort: 'add_time',
          order: 'desc'
        },
        dataForm: {
          id: undefined,
          question: '',
          answer: ''
        },
        dialogFormVisible: false,
        dialogStatus: '',
        textMap: {
          update: '编辑',
          create: '创建'
        },
        rules: {
          question: [{required: true, message: '问题不能为空', trigger: 'blur'}],
          answer: [{required: true, message: '回复不能为空', trigger: 'blur'}]
        },
        downloadLoading: false
      }
    },
    created() {
      this.getList()
    },
    methods: {
      getList() {
        this.listLoading = true;
        listIssue(this.listQuery).then(response => {
          this.list = response.data.data.list;
          this.total = response.data.data.total;
          this.listLoading = false
        }).catch(() => {
          this.list = [];
          this.total = 0;
          this.listLoading = false
        })
      },
      handleFilter() {
        this.listQuery.page = 1;
        this.getList()
      },
      resetForm() {
        this.dataForm = {
          id: undefined,
          question: '',
          answer: ''
        }
      },
      handleCreate() {
        this.resetForm();
        this.dialogStatus = 'create';
        this.dialogFormVisible = true;
        this.$nextTick(() => {
          this.$refs['dataForm'].clearValidate()
        })
      },
      createData() {
        this.$refs['dataForm'].validate((valid) => {
          if (valid) {
            createIssue(this.dataForm).then(response => {
              this.list.unshift(response.data.data);
              this.dialogFormVisible = false;
              this.$notify.success({
                title: '成功',
                message: '创建成功'
              })
            }).catch(response => {
              this.$notify.error({
                title: '失败',
                message: response.data.errmsg
              })
            })
          }
        })
      },
      handleUpdate(row) {
        this.dataForm = Object.assign({}, row);
        this.dialogStatus = 'update';
        this.dialogFormVisible = true;
        this.$nextTick(() => {
          this.$refs['dataForm'].clearValidate()
        })
      },
      updateData() {
        this.$refs['dataForm'].validate((valid) => {
          if (valid) {
            updateIssue(this.dataForm).then(() => {
              for (const v of this.list) {
                if (v.id === this.dataForm.id) {
                  const index = this.list.indexOf(v);
                  this.list.splice(index, 1, this.dataForm);
                  break
                }
              }
              this.dialogFormVisible = false;
              this.$notify.success({
                title: '成功',
                message: '更新成功'
              })
            }).catch(response => {
              this.$notify.error({
                title: '失败',
                message: response.data.errmsg
              })
            })
          }
        })
      },
      handleDelete(row) {
        deleteIssue(row).then(response => {
          this.$notify.success({
            title: '成功',
            message: '删除成功'
          });
          const index = this.list.indexOf(row);
          this.list.splice(index, 1)
        }).catch(response => {
          this.$notify.error({
            title: '失败',
            message: response.data.errmsg
          })
        })
      },
      handleDownload() {
        this.downloadLoading = true;
        import('@/vendor/Export2Excel').then(excel => {
          const tHeader = ['问题ID', '问题内容', '问题回复'];
          const filterVal = ['id', 'question', 'answer'];
          excel.export_json_to_excel2(tHeader, this.list, filterVal, '常见问题信息');
          this.downloadLoading = false
        })
      }
    }
  }
</script>
